I had a problem nipping a particular color of Italian vitreous glass this morning. It was a metallic veined color called clover, which is sold by Mosaic Merchantile. After several pieces shattered I started to wonder if it was the particular color that was the problem. I experimented with other colors using the same pair of nipppers (Mosaic Merchantile basic) and they broke just like normal. Has anyone had a problem cutting a particular color before?